More than 600 Porto city buses and taxis have been fitted with routers to provide free Wi-Fi service. It's being touted as the biggest Wi-Fi-in-motion network in the world. Sérgio Rodrigues/Veniam hide caption

itoggle caption Sérgio Rodrigues/Veniam

There is a hole in mobile security that could makes tens of millions of Americans vulnerable. iStockphoto hide caption

itoggle caption iStockphoto

A TrackingPoint rifle features a high-tech scope that includes a laser rangefinder and a Wi-Fi server. Courtesy of TrackingPoint hide caption

itoggle caption Courtesy of TrackingPoint

A phone booth serves as a free Wi-Fi hot spot in New York City's Columbus Circle. Anna Solo/ hide caption

itoggle caption Anna Solo/